Question

我是Android的新手，这是我的第一个应用程序。我在最近几天遇到了这个问题，只是放弃寻找答案。我非常感谢你的帮助。

单击按钮时会调用sendSelectedItem方法。在else if子句中，方法setTvText和setTvColor被简单地忽略，它们应该设置TextView的Text和Color但不做任何事情。接下来是我的web服务器上的php脚本上的httpPOST请求，它返回一个简单的String，这部分工作正常。

    public void sendSelectedItem(View v){

    if(v == findViewById(R.id.btnCancel)){
        setTvText("nothing happens");
        setTvColor(0);
    }
    else if (v == findViewById(R.id.btnSend)){
        setTvText("selection transmitted");
        setTvColor(1);

        /*SelectedItemHttpPost si = new SelectedItemHttpPost();
        try {
            String retResp = si.executeHttpPost(selectedItem);
            setTvText(retResp);
            setTvColor(2);
        }
        catch(Exception e){};*/
    }

}

您是否有想法，为什么只有在剩余的代码被注释掉时才执行setTvText和setTvColor，如上所述？

如果有帮助，我会粘贴SelectedItemHttpPost的代码。非常感谢你。

public class SelectedItemHttpPost{

private HttpClient client = null;
private HttpPost request = null;
private HttpResponse response = null;
private List<NameValuePair> postParameters = null;
private UrlEncodedFormEntity formEntity = null;
private String responsePHP = "";
private BufferedReader in = null;
private StringBuffer sb = null;


public SelectedItemHttpPost(){
}

public String executeHttpPost(String selectedItem) throws Exception{
    try{
    client = new DefaultHttpClient();
    request = new HttpPost("http://www.somedomain.com/test/test.php");
    postParameters = new ArrayList<NameValuePair>();
    postParameters.add(new BasicNameValuePair("arg1", selectedItem));
    formEntity = new UrlEncodedFormEntity(postParameters);

    request.setEntity(formEntity);
    response = client.execute(request);
    in = new BufferedReader((new InputStreamReader(response.getEntity().getContent())));

    sb = new StringBuffer("");
    sb.append(in.readLine());
    in.close();
    responsePHP = sb.toString();

    return responsePHP;
    }
finally     {}
}

}

Answer 1

OnCreate方法需要创建一个按钮对象，如：

btnCancel = (Button) findViewById (R.id.btnCancel);

然后在点击它时访问按钮对象：

if(v == btnCancel)
{
        setTvText("nothing happens");
        setTvColor(0);
}

简单地忽略TextView集文本和颜色

1 个答案: